Differences

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--- ice:servo-opls [2016/07/22 16:43] – Michael Radunsky
+++ ice:servo-opls [2016/07/22 18:01] – [Understanding the Transfer Function] Michael Radunsky
@@ Line 87: / Line 87: @@
 =====Understanding the Transfer Function=====
-<imgcaption xfer_func center|Schematic of the OPLS right-side panel,showing the configurable transfer function and its user-controls.>{{ :ice:opls-loopfilter-xfer-function.jpg?nolink&700 |}}</imgcaption>
+<imgcaption xferfunc|Schematic of the OPLS right-side panel, showing the configurable transfer function and its user-controls.>{{ :ice:opls-loopfilter-xfer-function.jpg?nolink&700 |}}</imgcaption>
-The charge pump in the OPLS outputs a signal proportional to the phase-error and the transfer function is as shown in <imgref xfer_func >.  However, the OPLS will typically be used to control a //frequency//-tunable device (such as a laser). In this configuration, the effective loop filter is not the one shown in <imgref opls_side_panel>, but includes a extra integration corresponding to converting the phase-error input to a frequency error. Thus, ω<sub>I  </sub>sets the frequency transition from single-integration to double-integration and ω<sub>I </sub> from single-integration to proportional feedback. It is important to understand this 'hidden' integrator when configuring the loop filter parameters.
+The charge pump in the OPLS outputs a signal proportional to the phase-error and the transfer function is as shown in <imgref xferfunc>.  However, the OPLS will typically be used to control a //frequency//-tunable device (such as a laser). In this configuration, the effective loop filter is not the one shown in <imgref opls_side_panel>, but includes a extra integration corresponding to converting the phase-error input to a frequency error. Thus, ω<sub>I  </sub>sets the frequency transition from single-integration to double-integration and ω<sub>I </sub> from single-integration to proportional feedback. It is important to understand this 'hidden' integrator when configuring the loop filter parameters.
 =====Calculating Phase Noise =====
@@ Line 107: / Line 107: @@
 </WRAP>
-**Beat Note Input **
+**Beat Note Monitor **
+The Front Panel for the ICE-CP1 has four SMA or FC connectors. The second bottom-most connector is an SMA which is the digitized (i.e. square-wave) version of the input beat-note after a divide-by-2. For example, if the input beat note is 6 GHz, the monitor will have a 3 GHz output.  The signal is ~0 dBm in power regardless of the strength of the input beat-note signal.
-The Front Panel for the ICE-CP1 has four SMA or FC connectors. The top connector (SMA for ICE-CP1-SMA, FC for ICE-CP1-FC) is the beat note signal input. When FC, this input should be a <1 mW signal containing overlapped light from both lasers. When an SMA, this input should be an electrical signal, typically the output of the D2-160.
 **External Reference Frequency Input **
@@ Line 115: / Line 116: @@
 The Front Panel for the ICE-CP1 has four SMA or FC connectors. The second top-most connector is an SMA input for the external frequency reference. The input is AC coupled and 50 Ω terminated. Max power is 10 dBm.
-**Beat Note Monitor **
+**Beat Note Input **
-The Front Panel for the ICE-CP1 has four SMA or FC connectors. The second bottom-most connector is an SMA which is the digitized (i.e. square-wave) version of the input beat-note after a divide-by-2. For example, if the input beat note is 6 GHz, the monitor will have a 3 GHz output.  The signal is ~0 dBm in power regardless of the strength of the input beat-note signal.
+The Front Panel for the ICE-CP1 has four SMA or FC connectors. The top connector (SMA for ICE-CP1-SMA, FC for ICE-CP1-FC) is the beat note signal input. When FC, this input should be a <1 mW signal containing overlapped light from both lasers. When an SMA, this input should be an electrical signal, typically the output of the D2-160.
 **Laser Current **